"InvisibleHand scours the web for better deals on the products viewed. Its big advantage over comparison websites is that prices are gathered “live”, whereas sites such as Kelkoo and Pricerunner list prices provided by retailers at intervals that may be out of date when you search".

"Invisible Hand will definitely make your online shopping activity more intelligent by giving you instant access to the best prices… Great software for online shopping that can potentially save you money from the moment you install it".

"Stop paying more than necessary… InvisibleHand uses real-time price technology to discreetly and automatically alert shoppers if a product they have been looking at online is available at a lower price elsewhere".

"This week we tested it on some popular purchases. First, we visited johnlewis.com to browse TVs. When we clicked on the 32-inch Samsung LE32B450C4W LCD HD-ready digital TV, a yellow band appeared at the top of the page telling us we could buy it for £298 on the Pixmania website – £51 less than at John Lewis".

"To make life even easier, there is a relatively new tool on the market called InvisibleHand. Whereas the old-fashioned comparison sites rely on feeds from the retailers, InvisibleHand will always find the current price of a particular product. With many retailers changing their prices on a daily basis, this is a big benefit".

"If you’ve ever wasted far too much time jumping from retailer to retailer to save those extra four dollars, you’ll appreciate InvisibleHand, which automatically compares prices across retailers in an unintrusive tab and provides you with links to competing deals".

"The Invisible Hand add-on for Firefox is an unobtrusive add-on that will notify the user if it knows of an Internet shop that is offering the product for less than the current shop the user is visiting".

"No matter which browser you use, InvisibleHand watches silently and invisibly in the background for you to go shopping. When a product appears on your browser, it lets you know if there’s a better price to be had elsewhere".

"We all know that sick feeling you get when you find something at a lower price than what you’ve JUST paid. There are zillions of price comparison engines out there, including Shopzilla and PriceGrabber, but [InvisibleHand] is handy because it does more of the work for you".